Primary Function
The PD-Free Test Transformer/Equipment is designed to:
Detect and suppress partial discharge (PD) phenomena in high-voltage electrical equipment during factory testing or preventive maintenance, ensuring the insulation performance meets safety and quality standards under high-voltage conditions.
Key Functional Details
Partial Discharge Detection
Apply high voltage (e.g., 1.5–3 times the rated voltage) to simulate extreme operating conditions and detect weak partial discharge (PD) within the equipment.
PD may cause insulation degradation, reduced equipment lifespan, or sudden failures (e.g., transformer breakdown, cable insulation burnout).
Insulation Performance Verification
Verify the long-term stability of equipment under high voltage, ensuring compliance with international standards (e.g., IEC 60270, GB/T 7354) for PD magnitude limits.
Example: Mandatory PD-free testing for critical equipment like power transformers, GIS switchgear, and cable accessories before factory release.
Withstand Voltage Testing
Combined with "withstand voltage tests," verify the equipment's ability to endure short-term high-voltage surges (e.g., lightning strikes, switching overvoltages) while monitoring discharge behavior.
Prevent insulation breakdown risks caused by PD.
Preventive Maintenance
Regular PD-free testing in power system maintenance to identify potential defects such as insulation aging, moisture ingress, or mechanical damage.
Technical Features
Low Corona Discharge Design: Specialized transformer structure (e.g., shielded windings, high-purity insulation materials) minimizes self-generated corona discharge interference.
High-Precision Measurement System: Equipped with PD detectors to quantify discharge magnitude (unit: pC, picocoulombs).
Multi-Voltage Adaptability: Supports AC, DC, and lightning impulse voltage tests (e.g., 10 kV–500 kV).
Typical Applications
Factory testing of power transformers, reactors, bushings, etc.
Insulation verification of high-voltage cable accessories (e.g., joints, terminations).
Insulation testing for wind power, photovoltaic, and other renewable energy equipment.
Research on discharge characteristics of new insulation materials/structures in laboratories.
Why PD-Free Testing Is Critical?
Partial discharge is an early indicator of insulation failure. Even minor discharges (<10 pC) can accumulate over time, leading to equipment malfunctions. PD-free testing ensures:
✅ Prevention of sudden insulation breakdown
✅ Extended equipment lifespan
✅ Compliance with grid safety requirements
Let me know if you need further refinements or application-specific details!
A compact, high-sensitivity instrument for detecting and analyzing partial discharge in power equipment. Features digital display, multi-frequency amplification, and smart diagnosis for accurate, reliable insulation assessment in transformers, cables, GIS, and switchgear.
